Let the Spaceman Beware // The Night Face — Poul Anderson

Ace Books, mass market paperback. One of three or four printings issued between 1978 and 1981 with the same Michael Whelan cover art. Variant title of "Let the Spaceman Beware!" (1963). Science fiction adventure novel. "The color, smell,, taste of an alien world, a non-human society, a globular cluster or the universe seen from the very edge of lightspeed ... these things Poul Anderson shows better than anyone."